36v Controller Wiring Help?

Davy2011

New Member
So I got a new ebike to work on, but there's a downside. I can't find the controller's wiring diagram anywhere onllne. I originally found the bike online called "MacWheel Ranger". This one looks to be a 350w model. I can't find what wires go where. I got this bike 4 days ago and i've been spending some time working on it, adding basic parts on it here n there. The bike shop that gave it to me told me the bike got into a wreck, so they had it dismantled. Luckily it came with it's battery and it still work as well! I got the wheel, frame, and well, the battery as well. After investigating and finding the controller hidden behind the battery's bottom mount, It looks to be a decent controller. But there's ANOTHER downside. The main wire's been cut! I can't determine what wire goes where! Basically this is a waterproof controller, but the bike shop cut the main wire that splits off to the controller, throttle, brakes, and likely the headlight(seeing as how this bike had a headlight, but it's not there.) But the good news is that it was just a extension. Here's a few photos I was able to take of it at least. But I do know the display is a KD21C. But the end of it is a weird oval connection and not a circular connection which is really annoying me. So any help would be needed! All i'm looking for is the wiring diagram as to what goes where, where can I find a part that has a oval connection, or i'll have to cut the controller's end and just wire it up to the beheaded main controller wire. I don't know exactly where that pink wire goes except it just has a extenstion for that one only, and a yellow port that doesn't really go anywhere. But I know one of the connections goes directly to the motor, so there's that benefit.

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harryS

Well-Known Member
Here the are wires that are in a typical extension cable. Matches the 9 cut wires. Are you sure the connector wasn't squashed? With everyone using similar 4:1 and 5:1 harnesses, I wonder why would someone make a limited run of somethinmg different.

1. Battery - from controller to display
2. Start - this comes from display and goes to battery voltage when display turns on
3. Ground - goes to throttle and display
4. Tx Data from display to controller
5. RX Data from controller to display
6. +5V to throttle
7. Throttle output
8. Brake - goes to brake lever.
9. Lights

And everyone uses a different color, so any color guesses I make are probably wrong.

This is not something you can do randomly. THe controller turns on when the start wire gets 48V. If you start putting 48V onto random wires, most of them will blow a circuit. You're going to have buy a new extension cable from somewhere.

Did it come with a display? If it didn't, consider buying a different display/controller combo, with waterproof cable.. The display sis usually the pricier part of the pair anyway.
 

Davy2011

New Member
Here the are wires that are in a typical extension cable. Matches the 9 cut wires. Are you sure the connector wasn't squashed? With everyone using similar 4:1 and 5:1 harnesses, I wonder why would someone make a limited run of somethinmg different.

1. Battery - from controller to display
2. Start - this comes from display and goes to battery voltage when display turns on
3. Ground - goes to throttle and display
4. Tx Data from display to controller
5. RX Data from controller to display
6. +5V to throttle
7. Throttle output
8. Brake - goes to brake lever.
9. Lights

And everyone uses a different color, so any color guesses I make are probably wrong.

This is not something you can do randomly. THe controller turns on when the start wire gets 48V. If you start putting 48V onto random wires, most of them will blow a circuit. You're going to have buy a new extension cable from somewhere.

Did it come with a display? If it didn't, consider buying a different display/controller combo, with waterproof cable.. The display sis usually the pricier part of the pair anyway.

I'm sure, and yes it came with its display. Looking at it, it looks like a USB-C port and it's really confusing me on why it's like that. I saw a exact LCD screen like the one I have, but I can't find anything that connects to it and then to the rest of the bike. Here's what it looks like.